Rika's mom and her little sister Yuria.I'm pretty sure that the girl in the pic is actually Rika's little sister Yuria and not her big sister like we first speculated. According to our sources Yuria looks a lot like Rika unlike her big sister. So at the moment we don't know much about her besides her name:

- she's about 17-18 years old - she used to play basketball - she's at least 163cm tall - and most importantly, she's fucking hot

She looks exactly like old school Rika and her ass could even rival her big sister's famous butt.

-- Yuria is 2 years younger than Rika, is a highschool student, and is on her school’s basketball team. She’s really good, back in 9th grade, she was chosen to play in Kanagawa-ken team.

-- Rika says that Yuria is really sweet to her and likes to spoil her.

-- Yuria was the one who came up with the plans in Kibasen for Rika.

-- Yuria doesn’t call her “Oneechan” but “Rika-chan”.

-- Rika’s mom and Yuria always go to MM concerts.

-- Years ago, some people spotted Rika at Yuria's school. It was Sports Day and Rika was there to see Yuria play.

I've seen a website of her school's basketball team. There was no pic or anything but it said she was 163 cm tall. The site was old, she must be taller now. (Some say about 10 cm taller than Rika.)Some people claimed to went to Jr. high with her said that she was super nice, but some said she had this "my sister is a Musume" attitude.

If that really is her big sis then daaaamn, Rika ain't the only hot chick in Ishikawa Family

ROFL looks like she's got a HUGE ASS too!!

How the fuck did I immediately know Daigong was gonna say something after I looked at that picture and saw that girls ass. Geez . Guess it must be a family trait, cuz Rikas is nice and big and round and looks like you could bounce a quarter right off of it *something I've tried on my girl-friends*

If that really is her big sis then daaaamn, Rika ain't the only hot chick in Ishikawa Family

ROFL looks like she's got a HUGE ASS too!!

How the fuck did I immediately know Daigong was gonna say something after I looked at that picture and saw that girls ass. Geez . Guess it must be a family trait, cuz Rikas is nice and big and round and looks like you could bounce a quarter right off of it *something I've tried on my girl-friends*

Ahem, not to destroy to much of your fantasy's but I think there is some "enhancement" going on here...